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    <title>Document</title>
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    <script>
      var uniquePathsWithObstacles = function (obstacleGrid) {
        let m = obstacleGrid.length
        let n = obstacleGrid[0].length
        let dp = new Array(m).fill().map(() => new Array(n).fill(0))
        for (let i = 0; i < m; i++) {
          if (obstacleGrid[i][0] == 1) {
            break
          }
          dp[i][0] = 1
        }
        for (let j = 0; j < n; j++) {
          if (obstacleGrid[0][j] == 1) {
            break
          }
          dp[0][j] = 1
        }
        for (let i = 1; i < m; i++) {
          for (let j = 1; j < n; j++) {
            if (obstacleGrid[i][j] == 1) {
              dp[i][j] = 0
            } else {
              dp[i][j] = dp[i - 1][j] + dp[i][j - 1]
            }
          }
        }
        return dp[m - 1][n - 1]
      }
    </script>
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